Bug #65730 [Com]: DateTime::format('W') returns wrong week number

Edit report at https://bugs.php.net/bug.php?id=65730&edit=1 ID: 65730 Comment by: mohsin at pie-solutions dot com Reported by: glavic at gmail dot com Summary: DateTime::format('W') returns wrong week number Status: Not a bug Type: Bug Package: Date/time related Operating System: ALL PHP Version: Irrelevant Block user comment: N Private report: N New Comment: Thank you for not deleting this thread/post/bug report. I encountered the same error.. Previous Comments: ------------------------------------------------------------------------ [2013-11-27 21:39:02] rodolphe at eveilleau dot fr Thank you for not delete these comments. I encountered the same situation. ------------------------------------------------------------------------ [2013-09-21 20:56:55] derick@php.net Nope, we won't delete it so that we can point other people to it in the future. ------------------------------------------------------------------------ [2013-09-21 18:51:06] glavic at gmail dot com Ah, I found it, it is 'o' format character. Sorry for your trouble. Can you delete this failed bug report? ;) Tnx ------------------------------------------------------------------------ [2013-09-21 18:48:10] glavic at gmail dot com I made a copy/paste typo before, but that doesn't matter now because you said that 'Y' returns the year of the date, which is totally correct, where was my head... I understand what you are saying; I agree that Dec 30 and 31 fall in week 1; but year 2014, not 2013. Maybe I should rephrase my question: how do I get correct week year from "echo (new DateTime('2013-12-30'))->format('W ????');" ? ------------------------------------------------------------------------ [2013-09-21 18:18:50] rasmus@php.net 2013-12-30 ('Y W');" returns "2013 01" is correct. The 'Y' is the year. The ISO 8601 Year for 2013-12-30 is obviously 2013. However the ISO 8601 Week number for 2013-12-30 is also just as obviously 1. So 2013 01 is correct. And your next statement makes no sense either: "So now we have two identical week number for year 2013 with a year difference between dates ;)" We are talking about Dec.30 and 31 in 2013. That is Monday and Tuesday. They both fall in ISO week 1 and they are both in 2013. Wednesday Jan.1 2014 also falls in ISO week 1 even though it is in 2014. That's how ISO weeks work. Is your confusion that you think the 'Y' has to be associated with the 'W' somehow? The 'Y' refers to the date you are formatting. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=65730 -- Edit this bug report at https://bugs.php.net/bug.php?id=65730&edit=1